Kontek is remarkable because, in contrast to similar facilities like Baltic-Cable and Konti-Skan, all land sections of the 119-kilometre (74 mi) onshore lines on Falster, Sealand and Germany are implemented as underground cable. This unusual measure, which raised the construction costs of Kontek significantly, was made for practical rather than technical reasons. Obtaining permission for building overhead cables can take a long time, and hence underground cables were used in order to ensure it was completed on schedule.

Switching diagram of AC filter used for HVDC Kontek. Each station has two such filters

Impedance of AC filter used at Kontek in dependence of frequency. Power grid frequency and their 11th, 13th, 23rd and 25th harmonics are marked

The high-voltage cable of the Kontek is implemented as paper-isolated oil-filled cable with two copper conductors with a cross section of 800 mm2 permanently joined in parallel. For better monitoring of the oil, the land sections of the Kontek cable are divided in sections of approx. 8 kilometres (5.0 mi), which are separated by oil-impermeable sockets from each other. In the proximity of these sockets - at some distance from the cable route - there are automatic stations for the monitoring of the oil pressure, the oil temperature and other operating parameters of the cable. For practical reasons, the 45-kilometre (28 mi) long submarine cable section through the Baltic Sea between Germany and Denmark was implemented as a single oil-filled section without sockets. As electrode cables of the Kontek, on the German and on the Danish side, commercial plastic-isolated 17 kV-cables are used.

The static inverter station in Bjæverskov was attached to an existing substation for 380 kV/110 kV. For the construction of the static inverter plant in Bentwisch a new construction site was chosen even though only one kilometer north there is still the old 220 kV/110 kV-substation which was built in the GDR. In 2002 the static inverter station in Bentwisch was extended to a 380 kV/110 kV-substation and connected by a 110 kV-line to the old 220 kV/110 kV-substation.

A supplement 400 MW connection between Germany and Zealand in 2018 and costing DKK 2.9 billion, is planned to use the Kriegers Flakoffshore wind farm, enabling the wind power to be transmitted to either country as well as passing power between the countries.[1][2]